Ok googled it they are bad.. I just smoked the 3 guys with boiling water. Used a syringe pumped hot water on them till they turned white and break up and started to fall off.
If that is in fact what it is, I would say it is bad. Aptasia X or the like should take care of it. I would wait to get a few more opinions before doing anything drastic but it sure does look like it from the pic.